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ID = 51093
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  Triode, vacuum   Universal 
  Ca. 1925 up to 1945 rare.
Identical to 201A_Philips
Similar Tubes
Normally replaceable-slightly different:
  UV201A ; UX201A
Other base:
  201A_B4 ; C507 ; PR52_Condor
Successor Tubes C509  

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =
Description Also made with UX4 and B4 base. Was a replacement for the UV201A and UX201A. The designation is not PH201A but 201A, although it looks like it. The PH series of tubes was made in the early 1930's. 
Dimensions (WHD)
incl. pins / tip
45 x 97 x 35 mm / 1.77 x 3.82 x 1.38 inch
Information source - - Manufacturers Literature   1924
201A_Philips: GP
George Papaiz

Peter den Boer

201A_Philips: own collection
Peter den Boer

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